meson CI: use vc++latest

Potentially more warnings

Signed-off-by: Rosen Penev <rosenp@gmail.com>

.github/workflows/on_PR_meson.yaml

@@ -54,7 +54,7 @@ jobs:
         env:
           CXXFLAGS: '/analyze'
         run: |
-          meson setup "${{github.workspace}}/build" --wrap-mode=${{matrix.deps}} -Ddefault_library=${{matrix.type}} -Dwarning_level=3 -Dcpp_std=c++20
+          meson setup "${{github.workspace}}/build" --wrap-mode=${{matrix.deps}} -Ddefault_library=${{matrix.type}} -Dwarning_level=3 -Dcpp_std=c++latest
           meson compile -C "${{github.workspace}}/build" --verbose
           meson test -C "${{github.workspace}}/build" --verbose